From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
82 Moby Thesaurus words for "mettlesome": active, acute, aggressive, agitable, animated, beany, brisk, bulldoggish, courageous, dauntless, dynamic, edgy, emotional, emotionally unstable, energetic, enterprising, enthusiastic, eruptive, excitable, explosive, fiery, forceful, forcible, full of pep, game, gamy, go-go, gritty, gutsy, gutty, hearty, high-mettled, high-spirited, high-strung, highly emotional, impetuous, incisive, inflammable, intense, irascible, irritable, keen, kinetic, lively, living, lusty, nervous, nervy, peppery, peppy, pertinacious, perturbable, plucky, prickly, red-blooded, resolute, robust, sensitive, skittish, smacking, snappy, spanking, spirited, spiritful, spunky, startlish, strenuous, strong, take-charge, take-over, tenacious, touchy, tough, trenchant, vibrant, vigorous, vivacious, vivid, volcanic, zestful, zesty, zippy
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